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Abstract

The physical metallurgy of high strength low alloy (HSLA) steel production by compact strip processing or direct slab casting is reviewed. Specimens were extracted from 50 mm thickness cast Nb + Ti(+ V)HSLA slabs and quenched to room temperature, before and after the slab was heat treated in a tunnel furnace at 1150°C. These specimens were analysed to track changes in composition and microstructure during processing, in particular the formation of complex (Nb,Ti)(C,N) precipitates during solidification and subsequent heat treatment. It is shown that partial dissolution of the precipitates takes place during thermal equilibration, increasing the solute content of niobium and titanium before hot rolling. Tailoring of the industrial thermomechanical processing route, to improve the Charpy toughness and hardness of thin slab cast niobium HSLA linepipe and other grades, is also described.

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Physical metallurgy of high strength low alloy strip steel production using compact strip processing

Abstract

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References